Obsada
Chester Clute
Timid Man
Tom Brown
Joe O'Hara
William Edmunds
Professor Berger
Sheila Ryan
Janet 'J.L.' Brannigan
Michael Vallon
Bettor
Charles Morton
Fight Spectator (uncredited)
Stanley Price
Fight Spectator (uncredited)
Sam Flint
Doctor
Harvey Parry
Bit Role (uncredited)
Margia Dean
Joy White
Lyle Talbot
Radio Announcer
Jack Perry
Trainer (uncredited)
Noble 'Kid' Chissell
Fight Spectator (uncredited)
Sol Murgi
Fight Spectator (uncredited)
Al Bain
Fight Spectator (uncredited)
John Cason
Tiger Johnson
Don 'Red' Barry
Mike O'Hara, "King Cobra"
Joseph Crehan
Oscar Brannigan